IN my history of the Mongols we have seen how Hulagu beguiled the Assassins and slaughtered them. We have seen also how he ended the Kalifat at Bagdad, showing no more regard for the heir of Mohammed than for the chief of those murderers who held that marvelous mountain-land south of the Caspian. The Kalif of Islam was trampled to death under horse-hoofs. The chief of the Assassins was treated with insult, endured for a time, and then slain like a wild beast. We are now to consider an expedition